I installed a Timney trigger on a post 64 Mod 70. Without any adjustments, the rifle will not cock. Is this problem solved by adjusting sear engagement, or over travel, or both. If both, in what order. Also, what magazine box would be needed for a M70 Sporter Magnum 300 WinMag. Like a dummy, I chose to glass bed this rifle at a busy time in my life, and lost or threw away all the trigger parts, pins, and mag box. I was able to replace most of it from Midwest Gun Works, but I'm having trouble figuring out which mag box to buy.